EP1121420A2 - Vaccins contre l'h patite a - Google Patents

Vaccins contre l'h patite a

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Publication number
EP1121420A2
EP1121420A2 EP99952573A EP99952573A EP1121420A2 EP 1121420 A2 EP1121420 A2 EP 1121420A2 EP 99952573 A EP99952573 A EP 99952573A EP 99952573 A EP99952573 A EP 99952573A EP 1121420 A2 EP1121420 A2 EP 1121420A2
Authority
EP
European Patent Office
Prior art keywords
hepatitis
virus
vaccine
inactivated
protease
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP99952573A
Other languages
German (de)
English (en)
Inventor
Erik SmithKline Beecham Biologicals S.A. D'HONDT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GlaxoSmithKline Biologicals SA
Original Assignee
SmithKline Beecham Biologicals SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SmithKline Beecham Biologicals SA filed Critical SmithKline Beecham Biologicals SA
Publication of EP1121420A2 publication Critical patent/EP1121420A2/fr
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N7/00—Viruses; Bacteriophages; Compositions thereof; Preparation or purification thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/12—Viral antigens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/16—Drugs for disorders of the alimentary tract or the digestive system for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/51—Medicinal preparations containing antigens or antibodies comprising whole cells, viruses or DNA/RNA
    • A61K2039/525—Virus
    • A61K2039/5252—Virus inactivated (killed)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
    • A61K2039/55505—Inorganic adjuvants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
    • A61K2039/55511—Organic adjuvants
    • A61K2039/55572—Lipopolysaccharides; Lipid A; Monophosphoryl lipid A
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/70—Multivalent vaccine
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2730/00—Reverse transcribing DNA viruses
    • C12N2730/00011—Details
    • C12N2730/10011—Hepadnaviridae
    • C12N2730/10111—Orthohepadnavirus, e.g. hepatitis B virus
    • C12N2730/10134—Use of virus or viral component as vaccine, e.g. live-attenuated or inactivated virus, VLP, viral protein
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
    • C12N2770/00011—Details
    • C12N2770/32011—Picornaviridae
    • C12N2770/32411—Hepatovirus, i.e. hepatitis A virus
    • C12N2770/32434—Use of virus or viral component as vaccine, e.g. live-attenuated or inactivated virus, VLP, viral protein
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
    • C12N2770/00011—Details
    • C12N2770/32011—Picornaviridae
    • C12N2770/32411—Hepatovirus, i.e. hepatitis A virus
    • C12N2770/32451—Methods of production or purification of viral material
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
    • C12N2770/00011—Details
    • C12N2770/32011—Picornaviridae
    • C12N2770/32411—Hepatovirus, i.e. hepatitis A virus
    • C12N2770/32461—Methods of inactivation or attenuation
    • C12N2770/32463—Methods of inactivation or attenuation by chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
    • C12N2770/00011—Details
    • C12N2770/32011—Picornaviridae
    • C12N2770/32411—Hepatovirus, i.e. hepatitis A virus
    • C12N2770/32471—Demonstrated in vivo effect

Definitions

  • the present invention relate-r-tmew vatcifle cornpositro ⁇ s, processes for their manufacture and their use in medicine.
  • the present invention relates to improved Hepatitis A vaccines adjuvanted with a potent immunostimulator, preferably such as monophosphoryl lipid A or a derivative thereof.
  • the invention also relates to combination vaccines in which the Hepatitis A vaccine is a component.
  • Hepatitis A vaccines are known.
  • the vaccine Havrix (Trade Mark), from SmithKline Beecham Biologicals can be used to prevent hepatitis A infections and is also formulated with aluminium hydroxide as adjuvant.
  • This vaccine is produced according to the procedure of Andre et al. It comprises an attenuated strain of the HM-175 Hepatitis A virus inactivated with formol (formaldehyde); see Andre et al [Prog Med. Virol. 1990, vol 37; -p72-95],
  • the vaccine Twinrix (Trade Mark) which is a combination of the above hepatitis A and hepatitis B antigens may be used to protect against Hepatitis A and Hepatitis B simultaneously.
  • the vaccine Hepatyrix (Trade Mark) which is a combination of the above hepatitis A antigen and a Salmonella typhimurium purified Vi polysaccharide may be used to protect against Hepatitis and typhoid simultaneously.
  • European patent 0 339 667 (Chemo Sero) describes the general concept of combining a hepatitis A antigen and a hepatitis B antigen to make a combination vaccine.
  • the adjuvant which is used is not critical: it must only be capable of enhancing the immune activity to a desired extent and not cause any side effects.
  • aluminium gel may be used, in particular aluminium hydroxide gel and aluminium phosphate gel.
  • a process for the production of inactivated Hepatitis A virus substantially free of host cell contamination comprising: a) culturing Hepatitis A virus and harvesting a hepatitis A preparation; b) treating said hepatitis A preparation with a protease; and thereafter c) separating intact virus from protease-digested material; d) inactivating said virus.
  • the protease digestion treatment does not adversely affect the Hepatitis A virus, but facilitates the breakdown and separation of host cell contaminants from the Hepatits A preparation
  • the Hepatitis A virus is derived from HM-175 strain.
  • substantially free of host cell contamination is meant that less than 10%, preferably less than 8%, more preferably less than 5% host cell protein can be detected by scanning of silver-stained SDS PAGE. More importantly and as determined by slot blot hybridisation one dose of HAV in the vaccine preferably contains less than 10 ng of host cell proteins.
  • the protease used is trypsin.
  • Other proteases that may be utilised include pronase, papain, and pepsin.
  • the protease treatment is preferably carried out at above room temperature, e.g. at about 37°C for about 2 hrs.
  • the separation of the intact virus from the protease and the digested components can be achieved by a variety of suitable methods, for example by permeation chromatography.
  • protease and digested components may be separated by any separation method that separates on the basis of size, for example ultra filtration.
  • the product can then be further purified by other steps to remove other contaminants.
  • the product can be further purified by subjecting the product to ion- exchange chromatography to remove any nucleic acid residue.
  • the protease digestion step of the method according to the invention can improve purification of the hepatitis A preparation due to two effects.
  • the protease digests any contaminating host proteins such that they are easier to separate in the chromatographic separation step that follows the protease treatment.
  • the digestion of contaminating host proteins allows better separation of other contaminating materials which would otherwise be associated with undigested host proteins, in particular nucleic acid, in the ion exchange step. It will be appreciated that these observed effects do not necessarily limit the invention in any way.
  • an inactivated Hepatitis A virus substantially free of contaminating host proteins, as defined above.
  • the inactivated hepatitis A virus may then be formulated into a vaccine.
  • Hepatitis A vaccine comprising an inactivated hepatitis A virus substantially free of host cell contaminants.
  • Such a vaccine may advantageously include a suitable adjuvant.
  • suitable adjuvants include an aluminium salt such as aluminium hydroxide gel or aluminium phosphate, but may also be a salt of calcium, iron or zinc, or may be an insoluble suspension of acylated tyrosine, or acylated sugars, cationically or anionically derivatised polysaccharides, or polyphosphazenes.
  • the highly purified hepatitis A virus may be formulated with strong adjuvant systems.
  • the adjuvant composition induces an immune response comprising Thl aspects.
  • Thl -type response is characterised by the production of LFN- ⁇ as opposed to a Th2-type response which is characterised by the production of cytokines such as LL-4, LL-5 and IL-10.
  • the isotypic profile of the humoral response can also be used as a marker for Thl or Th2-type responses.
  • Thl-type responses are often associated with the generation of antibodies of the IgG2a subtype while IgGl are markers of a Th2-type response. The situation is not as clear in humans but data suggest that IgGl and IgG4 could respectively be markers of Thl- and Th2-type responses.
  • Suitable adjuvant systems include for example a combination of monophosphoryl lipid A, preferably 3-O-de-acylated monophosphoryl lipid A (3D-MPL), and preferably formulated together with an aluminium salt.
  • monophosphoryl lipid A preferably 3-O-de-acylated monophosphoryl lipid A (3D-MPL)
  • 3D-MPL 3-O-de-acylated monophosphoryl lipid A
  • An enhanced system involves the combination of monophosphoryl lipid A and a saponin derivative particularly the combination of QS21 and 3D-MPL as disclosed in WO 94/00153, or a less reactogenic composition where the QS21 is quenched with cholesterol as disclosed in WO 96/33739.
  • a vaccine comprising a virus of the present invention, adjuvanted with monophosphoryl lipid A or a derivative thereof.
  • the vaccine additionally comprises a saponin, more preferably QS21.
  • the formulation additionally comprises an oil in water emulsion and d,l- alpha-tocopherol.
  • the present invention also provides a method for producing a vaccine formulation comprising mixing a purified virus of the present invention together with a pharmaceutically acceptable excipient or carrier, such as 3D-MPL.
  • the purified virus of the invention may advantageously be combined with other antigens so that it is effective in the prophylaxis or treatment of other diseases in addition to hepatitis A infections.
  • a preferred combination involves a combination containing a hepatitis B antigen.
  • Hepatitis B surface antigen (HBsAg) is well documented. See, for example, Harford et al in Develop. Biol. Standard 54, page 125 (1983), Gregg et al in Biotechnology, 5, page 479 (1987), EP-A-0 226 846, EP-A-0 299 108 and references therein.
  • Hepatitis B surface antigen' or 'HBsAg' includes any HBsAg antigen or fragment thereof displaying the antigenicity of HBV surface antigen.
  • HBsAg as herein described may, if desired, contain all or part of a pre-S sequence as described in the above references and in EP-A- 0 278 940.
  • the HBsAg may comprise a polypeptide comprising an amino acid sequence comprising residues 12-52 followed by residues 133-145 followed by residues 175-400 of the L-protein of HBsAg relative to the open reading frame on a Hepatitis B virus of ad serotype (this polypeptide if referred to as L*; see EP 0 414 374).
  • HBsAg within the scope of the invention may also include the preSl-preS2-S polypeptide described in EP 0 198 474 (Endotronics) or analogues thereof such as those described in EP 0 304 578 (McCormick and Jones).
  • HBsAg as herein described can also refer to mutants, for example the 'escape mutant' described in WO 91/14703 or EP 0 511 855 Al, especially HBsAg wherein there is an amino acid substitution at position 145 to arginine from glycine.
  • the particles may comprise for example S protein alone or may be composite particles, for example (L*,S) where L* is as defined above and S denotes the S-protein of HBsAg.
  • the said particle is advantageously in the form in which it is expressed in yeast.
  • the invention in a further aspect provides a vaccine formulation as described herein for use in medical therapy, particularly for use in the treatment or prophylaxis of hepatitis viral infections.
  • the vaccine accordingly to the invention is a therapeutic vaccine useful for the treatment of ongoing hepatitis infections, more especially hepatitis A and/or hepatitis B infections in humans suffering therefrom.
  • the invention provides a vaccine composition for the treatment or prophylaxis of Hepatitis A and/or Hepatitis B infections.
  • the hepatitis vaccine composition of the invention contains other antigens so that it is effective in the treatment or prophylaxis of one or more other bacterial, viral or fungal infections.
  • the hepatitis vaccine formulation according to the invention preferably contains at least one other component which may be selected from non-hepatitis antigens which are known in the art to afford protection against one or more of the following diseases: diphtheria, tetanus, pertussis, Haemophilus influenzae b (Hib), and polio.
  • the vaccine according to the invention includes HBsAg as hereinabove defined.
  • Suitable components for use in such combination vaccines are already commercially available and details may be obtained from the World Health Organization.
  • the polio component may be the Salk inactivated polio vaccine (LPN).
  • the pertussis vaccine component may comprise a whole cell or acellular product.
  • the hepatitis or combination vaccine according to the invention is a paediatric or an adolescent vaccine.
  • Preferred combination vaccines according to the invention for adolescent use include one or more components selected from antigens which are known in the art to provide protection against one or more of the following diseases: human papillomavirus (HPN), herpes simplex virus (HSN), Epstein Barr virus (EBN), Varicella Zoster virus (VZV), human cytomegalovirus (HCMN), Toxoplasma gondii.
  • HPN human papillomavirus
  • HSN herpes simplex virus
  • EBN Epstein Barr virus
  • VZV Varicella Zoster virus
  • HCMN human cytomegalovirus
  • Toxoplasma gondii Toxoplasma gondii.
  • each antigen in the vaccine dose is selected as an amount that induces an immunoprotective response without significant adverse side effects in typical vaccinees. Such amount will vary depending on which specific immunogens are employed. Generally it is expected that each dose will comprise 0.01 to 1.0 ⁇ g protein dose for Hepatitis A, most preferably from between 0.06 to 0.220 ⁇ g protein/dose. For antigens other than Hepatitis A, for example HBsAg, HSN etc, the amount of protein per dose may be higher, e.g. up to about 20 ⁇ g per dose. An optimal amount of each of one or more immunogens for a particular vaccine can be ascertained by standard studies involving observation of antibody titres and/or other responses in subjects. Following an initial vaccination, subjects may receive a boost within about 4 weeks.
  • a method of manufacture of a vaccine effective in preventing or treating hepatitis infection comprising mixing the hepatitis antigen as defined herein with MPL or a derivative thereof.
  • the method comprises mixing the hepatitis antigen as defined herein with MPL or a derivative thereof.
  • one or more additional components are preferably admixed with the inactivated Hepatitis A vaccine to provide a combination vaccine.
  • Hepatitis A virus HM175 is cultured on MRC5 cells (Andre et al supra) and the virus is harvested after washing of the cell layer to remove serum used in growth media. After freeze/thaw a detergent (Tween 20) is added to extract the virus from the cell debris. Cell debris is removed by filtration through a 0.22 ⁇ m membrane. Filtrate is further subjected to ultra-filtration. The resulting concentrate can eventually be clarified by centrifugation at 5 - 10,000 x g for 1-2 hours.
  • a detergent Teween 20
  • the concentrate containing the HAV virus is treated with purified trypsin extracted from pig pancreas.
  • the trypsin used is double crystallised and kept frozen before use.
  • the concentrate is prewarmed at 37°C under constant agitation. Trypsin is then added at a ratio of 440 IU per ml of concentrate, and the mixture gently stirred for minimum 2hrs at 37°C (maximum 2.5hrs).
  • the product can be processed without delay at ambient temperature on an ultrafiltration device in order to reduce the volume.
  • the membrane used is regenerated cellulose with nominal cut-off of 30,000 Dalton, and up to a maximum of 8ml of trypsinated product per cm 2 of membrane, is processed at a transmembrane pressure between 0.2 and 0 6 bar to achieve a concentration factor of between 8 and 12.
  • PERMEATION CHROMATOGRAPHY The aim of this step is to separate proteins from the intact HAV virus.
  • a permeation chromatography step is conducted after trypsin treatment, conditions have to be adapted to eliminate residual trypsin as well.
  • the separation gel used is Permeation Sepharose 4BFF.
  • the virus is eluted at a smaller retention volume than the smaller protein fragments which are eluted with larger retention volume (closer to the total volume of the column).
  • Chromatography parameters are as follows:
  • This purification step is to reduce the DNA content (originating from MRC5 cells). This step is run according to the batch principle.
  • the pool from the previous chromatographic step is adjusted to 0.3M NaCl and then mixed with the ion exchange resin under mild agitation for lhr (maximum 1.5hr) at room temperature.
  • the gel is eliminated by filtration.
  • the unfixed HAV virus suspension is then diluted to adjust the NaCl concentration to 150mM.
  • the ion exchange purification step can also be conducted by column chromatography.
  • the final purified product is sterile filtered on 0.22 ⁇ m filter. Chromatographic parameters are as follows:
  • the product is diafiltered and concentrated in order to reduce the formaldehyde content and to be preadsorbed on an aluminium salt (preferably aluminium hydroxide or aluminium phosphate).
  • aluminium salt preferably aluminium hydroxide or aluminium phosphate
  • the complete ultrafiltration device Prior to use, the complete ultrafiltration device is sanitised with 0. IN NaOH for at least 30 minutes. The device is then thoroughly rinsed with diafiltration buffer and the membranes are then coated with a buffer containing amino acids (Travasol). Finally the device is rinsed with diafiltration buffer.
  • the final product is sterile filtered on a 0.22 ⁇ m filter.
  • the HAV particle of example 1 was first adsorbed on to aluminium hydroxide (superfos) followed by the addition of free 3D-MPL.
  • group 1 the individual antigens were adsorbed on to the aluminium salt 0.025mg Al 3+ ion (Al(OH) 3 Superfos) for HA, 0.475 mg A13+ion (A1P0 4 Superfos type).
  • group 2 and 5 50 ⁇ g/dose of free 3D-MPL was added to adsorbed Hepatitis S antigen to which the adsorbed hepatitis A component was added.
  • group 3D-MPL was separately adsorbed on to the aluminium salt, and then the three adsorbed components were mixed together.
  • mice were immunised intramuscularly three times at 2 weeks interval with HAV/HBs formualtions (1/10 HD).
  • Antibody response to Hbs were monitored by ELISA at 14 days post II and 14 days post III.
  • the isotypic profile of the anti-HBs response was analysed at 14 days post II.
  • Antibody response to HAV was monitored 14 days post III.
  • mice were immunised intraperitoneally once with HAV/HBs formulations (1/2 HD). Antibody response to Hbs and HAN were monitored by ELISA at 28 days post injection.
  • HAV Hepatitis A Virus antigen
  • mice sera (4 dilutions starting at 1/10) human anti-HAV reference (8 dilutions starting at 80 mlU/ml) and controls were performed in anti-HAV negative human sera.
  • Anti-HAV antibody titers were calculated from the reference by SoftmaxPro (using a four parameters equation) and expressed in mlU/ml.
  • HAV/HBs (HAB) formulations were administered to healthy subjects.
  • Serum titres of anti-HAV antibodies were measured by ELISA (Enzymun test from Boehringer Mannheim) and anti-HBs antibodies by radioimmunoassay (RIA) using test kit AUSAB - Abbott.
  • the assay cut-off for anti-HAV antibodies was 33 mlU/ml and the assay cut-off for anti-HBs antibodies was 1 mlU/ml.
  • Subjects with anti-HAV antibody titres of 33 mJTJ/ml were considered to be seropositive for anti-HAV antibodies.
  • Subjects with anti-HBs antibody titres 1 mlU/ml were considered to be seropositive for anti-HBs antibodies.
  • Seroprotection rate for anti-HBs was defined as the ratio of subjects with anti-HBs titres 10 mlU/ml.
  • MPL has a clear effect on anti-HAV kinetics. It induces a faster and stronger immune response with a marked anamnestic response observed at Mth 6.5 and Mth 7 (i.e. 14 and 30 days respectively, after the last vaccine dose).
  • the candidate HAB/MPL vaccine exhibited a very good safety and reactogenicity profile. It was very immunogenic after a full vaccination course of 2 doses in the study cohort of healthy adults aged 18-40 years. There was a strong priming and faster immune response to both hep A & B antigens. 1. Anti-HAV Kinetics

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Abstract

Ce procédé de production de virus inactivé de l'hépatite A, sensiblement exempt de contamination par des cellules hôtes, consiste, (a), à cultiver le virus de l'hépatite A et à recueillir une préparation de celui-ci, (b), à traiter cette préparation à l'aide d'une protéase, puis, (c), à séparer le virus intact du matériau digéré par la protéase et, (d), à inactiver le virus. Cette invention a également trait au virus inactivé de l'hépatite A, de préférence en association avec des produits d'addition forts.
EP99952573A 1998-10-16 1999-10-08 Vaccins contre l'h patite a Ceased EP1121420A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9822714A GB9822714D0 (en) 1998-10-16 1998-10-16 Vaccines
GB9822714 1998-10-16
PCT/EP1999/007765 WO2000023574A2 (fr) 1998-10-16 1999-10-08 Vaccins contre l'hépatite a

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EP1121420A2 true EP1121420A2 (fr) 2001-08-08

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EP99952573A Ceased EP1121420A2 (fr) 1998-10-16 1999-10-08 Vaccins contre l'h patite a

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US (2) US6991929B1 (fr)
EP (1) EP1121420A2 (fr)
JP (1) JP4523164B2 (fr)
CA (1) CA2347084C (fr)
GB (1) GB9822714D0 (fr)
WO (1) WO2000023574A2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6825027B2 (en) * 2001-12-10 2004-11-30 Baxter Healthcare S.A. Method of production of purified hepatitis a virus particles and vaccine preparation
WO2005070454A2 (fr) * 2004-01-27 2005-08-04 Bharat Biotech International Limited Nouveau procede de preparation d'un vaccin contre l'hepatite a
NZ560930A (en) * 2005-02-16 2011-06-30 Novartis Vaccines & Diagnostic Hepatitis B virus vaccine comprising a hepatitis B virus surface antigen, aluminium phosphate, 3-O-deacylated monophosphoryl lipid A and a triethylammonium ion
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JP5854559B2 (ja) 2009-07-06 2016-02-09 ヴァリエーション バイオテクノロジーズ インコーポレイテッド 小胞を調製する方法及びこれから製造される製剤
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CA2347084C (fr) 2011-02-15
US6991929B1 (en) 2006-01-31
WO2000023574A2 (fr) 2000-04-27
US20050112144A1 (en) 2005-05-26
JP4523164B2 (ja) 2010-08-11
GB9822714D0 (en) 1998-12-09
WO2000023574A3 (fr) 2000-07-27
CA2347084A1 (fr) 2000-04-27
JP2002527105A (ja) 2002-08-27

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